polyhorn-core 0.4.0

Core types used in Polyhorn.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

use std::rc::{Rc, Weak as WeakRc};

use super::{Instance, Link, Memory, Platform, Reference, State};

/// This is a weak reference to an instance that can be converted into a link at
/// request.
pub struct Weak<P>
where
    P: Platform + ?Sized,
{
    instance: WeakRc<Instance<P>>,
}

impl<P> Weak<P>
where
    P: Platform + ?Sized,
{
    pub fn new(instance: &Rc<Instance<P>>) -> Weak<P> {
        Weak {
            instance: Rc::downgrade(instance),
        }
    }

    pub fn with_link<F, T>(&self, op: F) -> Option<T>
    where
        F: FnOnce(&WeakLink<P>) -> T,
    {
        if let Some(instance) = self.instance.upgrade() {
            Some(op(&WeakLink {
                instance: &instance,
                memory: &instance.memory(),
            }))
        } else {
            None
        }
    }
}

impl<P> Clone for Weak<P>
where
    P: Platform + ?Sized,
{
    fn clone(&self) -> Self {
        Weak {
            instance: self.instance.clone(),
        }
    }
}

pub struct WeakLink<'a, P>
where
    P: Platform + ?Sized,
{
    instance: &'a Rc<Instance<P>>,
    memory: &'a Memory,
}

impl<'a, P> WeakLink<'a, P>
where
    P: Platform + ?Sized,
{
    pub fn new(instance: &'a Rc<Instance<P>>, memory: &'a Memory) -> WeakLink<'a, P> {
        WeakLink { instance, memory }
    }
}

impl<'a, P> Link for WeakLink<'a, P>
where
    P: Platform + ?Sized,
{
    type Platform = P;

    fn instance(&self) -> &Rc<Instance<Self::Platform>> {
        self.instance
    }

    fn memory(&self) -> &Memory {
        self.memory
    }
}

pub struct WeakReference<P, T>(Weak<P>, Reference<T>)
where
    P: Platform + ?Sized,
    T: 'static;

impl<P, T> WeakReference<P, T>
where
    P: Platform + ?Sized,
    T: 'static,
{
    pub fn new(weak: Weak<P>, reference: Reference<T>) -> WeakReference<P, T> {
        WeakReference(weak, reference)
    }

    pub fn replace(&self, value: impl Into<T>) -> Option<T> {
        self.0.with_link(|link| self.1.replace(link, value.into()))
    }

    pub fn apply<F, O>(&self, op: F) -> Option<O>
    where
        F: FnOnce(&mut T) -> O,
    {
        self.0.with_link(|link| self.1.apply(link, op))
    }

    pub fn with_link<F, O>(&self, op: F) -> Option<O>
    where
        F: FnOnce(&WeakLink<P>) -> O,
    {
        self.0.with_link(op)
    }

    pub fn queue_rerender(&self) -> bool {
        self.0.with_link(|link| link.queue_rerender()).is_some()
    }
}

impl<P, T> Clone for WeakReference<P, T>
where
    P: Platform + ?Sized,
    T: 'static,
{
    fn clone(&self) -> Self {
        WeakReference(self.0.clone(), self.1)
    }
}

pub struct WeakState<P, T>(Weak<P>, State<T>)
where
    P: Platform + ?Sized,
    T: 'static;

impl<P, T> WeakState<P, T>
where
    P: Platform + ?Sized,
    T: 'static,
{
    pub fn new(weak: Weak<P>, state: State<T>) -> WeakState<P, T> {
        WeakState(weak, state)
    }

    pub fn replace(&self, value: T) -> Option<T> {
        self.0.with_link(|link| self.1.replace(link, value))
    }
}

impl<P, T> Clone for WeakState<P, T>
where
    P: Platform + ?Sized,
    T: 'static,
{
    fn clone(&self) -> Self {
        WeakState(self.0.clone(), self.1)
    }
}